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Post by lollygagger on Jun 10, 2018 19:06:53 GMT
One thing leads to another, I was only going to mop out the bilge! I shan't be rushing into it but now I know it's wrong... Got any big, fine thread plumbing taps? Ive some big fine thread taps i inherited off my dad in my office, never used in 30 odd years!! ill try get everything ive got tomorrow night when Im in work! Get it bled with the skintank as is.....i cant see you fighting the River Thames any time soon!!😉  You are correct and yes that's what I'll do for now ... while slowly sorting the other tank. First thing will be get the threads sorted and fit some fittings in them.  |
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Post by TonyDunkley on Jun 12, 2018 4:39:09 GMT
It's all plumbed correctly but I believe a Beta 43 is supposed to be 43HP? 43/4 = 11sq ft of skin (tank). Nope, more like 8 at a guesstimate, I'll measure up next time. Whether it has any baffles is anyone's guess. The outlets are curved steel pipe welded to the tank so no chance of feeling for baffles with a bent coathanger or whatever. The "spare" skin tank has short stubs (cut off by the looks), but not drilled through the tank. The skin tank itself must cover 1 sq. ft. of shell plating for every 4 bhp the engine is capable of producing, and should include one horizontal baffle plate at half height with the inlet and outlet connections at the same end of the tank. I would be inclined to make that fixed flooring above the skin tanks removeable, . . not necessarily loose and instantly liftable, but even if it meant a few minutes work with a spanner and/or a screwdriver to get it out of the way, the access would be so much better for routine maintenance jobs like belt adjustment or replacement. Also if your boat carries any stern trim the skin tank air venting plug, or possibly plugs, you're thinking of installing need to be positioned at the forard ends of tanks. I over estimated. 3ft x 1.75ft = 5.25sq ft. Almost exactly half your recommendation ...and there sits the second tank, unused. That's naughty but could be far worse. There aren't many hours on the engine and there is the second tank fitted. Series or parallel? The shell is well made, I'm going to guess there is a horizontal baffle. If there isn't, having inlet snd outlet at the same end would be a tragedy. Pipe the second tank in series, . . . the slightest differences in the pipe runs, gradient and bend radius for instance, will make the flow of coolant 'favour' one tank over the other and reduce the effectiveness of both if they're piped in parallel. Run the pipe and/or hose connecting the tanks to each other from the lower connection on the first to the upper connection on the second. Looking at the photo's of the unused tank, the welded on fittings look a bit on the small side. The piping runs on that cooling system need to be at least the same bore as the connections on the engine header tank and gearbox oil cooler (28 mm) and free of constrictions, and if the fittings on the one tank that's plumbed in already are the same size then the non-positive displacement circulating pump on the engine is really going to struggle to move enough coolant around the system at the rate it needs to when, or if, you run the engine at anything like it's rated output for any longer than a few minutes. I'm guessing from what you say that the inlet and outlet connections are both at the same end of the tanks, . . fingers crossed that there is a baffle plate in both of them, and that the engine wasn't 'cooked' in it's first few hours of running from new when pistons would be more prone to 'picking up'. |
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Post by lollygagger on Jun 12, 2018 10:15:22 GMT
Good point about the fitting sizes. They are are small with internal threads so would be even further reduced by screwing the next bit inside. It would be an engine out job to sort the bottom one which is only just within reach by lying on the engine. Back to the drawing board.  |
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Post by Jim on Jun 12, 2018 13:22:46 GMT
 Â there is nothing my young friend, absolutely nothing, that is half as well worth doing as simply messing about in boats !!! Until you get thrown in the hedge by the slipstream of a fast car.... Poop poop! |
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 there is nothing my young friend, absolutely nothing, that is half as well worth doing as simply messing about in boats !!!